Marius Wachtler discovered that Pidgin incorrectly handled malformed
YMSG messages in the Yahoo! protocol handler. A remote attacker could
send a specially crafted message and cause Pidgin to crash, leading to
a denial of service. This issue only affected Ubuntu 10.04 LTS and
10.10. (CVE-2011-1091)

Marius Wachtler discovered that Pidgin incorrectly handled HTTP 100
responses in the MSN protocol handler. A remote attacker could send a
specially crafted message and cause Pidgin to crash, leading to a
denial of service. (CVE-2011-3184)

Diego Bauche Madero discovered that Pidgin incorrectly handled UTF-8
sequences in the SILC protocol handler. A remote attacker could send a
specially crafted message and cause Pidgin to crash, leading to a
denial of service. (CVE-2011-3594).

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